Meeting Abstract

Niche breadth results from physiological and phenological expression. The seasonal niche describes the time of year that an organism is expected to grow and reproduce. I quantified seasonal niche breadth and physiological correlates of the seasonal niche in a short-lived C3-C4 intermediate annual plant. Niche breadth was estimated by quantifying the extent of spatial and temporal variation in performance. Niche breadth was then compared to physiological and phenological variation to determine how variation in physiological tolerance contributes to variation in seasonal niche breadth.